polish government has opened a website for ukrainians seeking safety and trying to cross the ukrainian-polish border:
ua.gov.pl
as of 13:10 polish time, it has been said as many people as possible will be let through the borders. they are also supposed to let through children who do not have passports, as to not divide families.
Polish person here, I've been on the website, it looks legit! Adding the full link here:
Urząd do Spraw Cudzoziemców
Information is available in Polish, Ukrainian, Russian and English
Please get the help available!
